package com.sky.service.impl;

import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.List;

@Service
@Slf4j
public class DishServiceImpl implements DishService {
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 新增菜品
     * @param dishDTO
     */
    @Transactional
    @Override
    public void saveWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        dishMapper.insert(dish);
        Long dishId = dish.getId();
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishId);
            });
            dishFlavorMapper.insertBatch(flavors);
        }
    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    public PageResult selectDishPage(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage(dishPageQueryDTO.getPage(),dishPageQueryDTO.getPageSize());
        Page<DishVO> page = dishMapper.selectDishPage(dishPageQueryDTO);
        return new PageResult(page.getTotal(),page.getResult());
    }

    /**
     * 删除菜品
     * @param ids
     */
    @Transactional
    @Override
    public void delete(List<Long> ids) {
        //起售中的菜品不能删除
        for (Long id : ids) {
            Dish dish = dishMapper.selectById(id);
            //判断菜品是否在起售中
            if (dish.getStatus() == StatusConstant.ENABLE){
                //抛异常显示菜品在起售中
                throw new DeletionNotAllowedException(MessageConstant.DISH_ON_SALE);
            }
        }
        //被套餐关联的菜品不能删除
        //通过菜品id在菜品套餐关系表中查询对应的套餐id
        List<Long> setmealIds = setmealDishMapper.selectSetmealIdByDishId(ids);
        //判断菜品是否被套餐关联
        if (setmealIds != null && setmealIds.size() > 0){
            //抛异常显示菜品被套餐关联
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品后，关联的口味数据也需要删除掉
        for (Long id : ids) {
            //根据id删除菜品表中的菜品数据
            dishMapper.deleteById(id);
            //根据菜品id删除菜品口味关系表中的数据
            dishFlavorMapper.deleteByDishId(id);
        }
    }

    /**
     * 查询菜品以及菜品口味
     * @param id
     * @return
     */
    @Override
    public DishVO selectDishWithFlavorById(Long id) {
        //根据id查询菜品（菜品表）
        Dish dish = dishMapper.selectById(id);
        //根据菜品id查询口味（菜品口味关系表）
        List<DishFlavor> dishFlavors = dishFlavorMapper.selectByDishId(id);

        DishVO dishVO = new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(dishFlavors);
        return dishVO;
    }

    /**
     * 更新菜品以及菜品口味
     * @param dishDTO
     */
    @Transactional
    @Override
    public void updateDishWithFlavor(DishDTO dishDTO) {
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO,dish);
        //修改菜品表数据
        dishMapper.update(dish);
        //删除口味表数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //获取新输入的口味
        List<DishFlavor> dishFlavors = dishDTO.getFlavors();
        //判断是否有输入，如果有输入口味信息，则添加到菜品口味关系表中
        if (dishFlavors != null && dishFlavors.size() > 0){
            //添加菜品id
            dishFlavors.forEach(dishFlavor -> {
                dishFlavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(dishFlavors);
        }
}

    /**
     * 根据分类id查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId,String name) {
        //查询该菜品分类下被启用的菜品
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .name(name)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 菜品启售停售
     * @param status
     * @param id
     * @return
     */
    @Override
    public void updateStatus(Integer status, Long id) {
        //修改菜品启售停售状态
        Dish dish = Dish.builder().
                status(status).
                id(id).
                build();
        dishMapper.update(dish);
        //如果菜品停售则套餐也需停售
        if (status == StatusConstant.DISABLE){
            //通过菜品id从套餐菜品表中获取被停售菜品所在的所有套餐的id集合
            List<Long> setmealIds = setmealDishMapper.selectSetmealIdsByDishId(id);
            //遍历集合，将每一个拥有停售菜品的套餐停售
            for (Long setmealId : setmealIds) {
                Setmeal setmeal = Setmeal.builder().
                        status(StatusConstant.DISABLE).
                        id(setmealId).
                        build();
                //套餐表中更新数据
                setmealMapper.update(setmeal);
            }
        }
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);
        List<DishVO> dishVOList = new ArrayList<>();
        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);
            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.selectByDishId(d.getId());
            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }
        return dishVOList;
    }
}
